What is the name given to the group that does not receive the experimental treatment in an experiment?

The group that does not receive the experimental treatment is called the control group. This group serves as a baseline for comparison against the group that undergoes the treatment, known as the experimental group. By keeping conditions identical except for the treatment, researchers can isolate the effects of the treatment and determine whether it has a significant impact on the outcomes being measured. The control group helps validate the experiment's results by showing what happens in the absence of the experimental variable, thus allowing scientists to draw more reliable conclusions about the effectiveness of the treatment.